T. ZAKRZEWSKI, “Spectral analysis of vibrations in control investigations of vibroacoustic heads KGS-320”, Arch. Acoust., vol. 12, no. 2, pp. 89–111, Jun. 1987, Accessed: Mar. 04, 2026. [Online]. Available: https://acoustics.ippt.gov.pl/index.php/aa/article/view/3084